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Contents
#--
# Copyright (C)2007-10 Tony Arcieri
# You can redistribute this under the terms of the Ruby license
# See file LICENSE for details
#++
module Coolio
module Meta
# Use an alternate watcher with the attach/detach/enable/disable methods
# if it is presently assigned. This is useful if you are waiting for
# an event to occur before the current watcher can be used in earnest,
# such as making an outgoing TCP connection.
def watcher_delegate(proxy_var)
%w{attach attached? detach enable disable}.each do |method|
module_eval <<-EOD
def #{method}(*args)
if defined? #{proxy_var} and #{proxy_var}
#{proxy_var}.#{method}(*args)
return self
end
super
end
EOD
end
end
# Define callbacks whose behavior can be changed on-the-fly per instance.
# This is done by giving a block to the callback method, which is captured
# as a proc and stored for later. If the method is called without a block,
# the stored block is executed if present, otherwise it's a noop.
def event_callback(*methods)
methods.each do |method|
module_eval <<-EOD
remove_method "#{method}"
def #{method}(*args, &block)
if block
@#{method}_callback = block
return
end
if defined? @#{method}_callback and @#{method}_callback
@#{method}_callback.call(*args)
end
end
EOD
end
end
end
end
Version data entries
38 entries across 38 versions & 6 rubygems